According to Newton's first law, an object will maintain the constant velocity motion (or at rest) in a direction if it is subjected no net force in that direction. In projectile motion, in the horizontal direction, the net force =0, thus we have Vx =Vx0, i.e. Vx does not change during the motion.
May 27th, 2015
Did you know? You can earn $20 for every friend you invite to Studypool!